What are flat feet? An inherited condition in which there is little or no arch to the bottom of the foot. Most people's feet have a space on the inner side where the bottom of the foot is off the ground (the "arch" of the foot). Small children do not have an arch: it develops between the ages of 3 and 10. People who have a low arch, or no arch at all are said to have flat feet - sometimes referred to as "fallen arches", but as most of these people always had a low arch that term is misleading. Causes Running cannot cause flat feet, however, many runners with flat feet overpronate, and overpronation can cause pain in your feet, shins and knees. Self Care If running is giving you aches and pains, a motion-control shoe with a straight last can help. People with flat feet should examine their daily and athletic footwear to ensure a proper fit, strong arch support and a firm heel counter for extra support and stability. Over-the-counter arch supports or orthotics can provide additional support. If none of these help, see a sports-oriented physician for custom-made orthotics.

If the width of the instep (AB) at its widest part is less than 1cm, the foot is considered as flat (right). If the width of the footprint at its narrowest part (BC) is less than 1cm, the arch is considered high (center). All other footprints are considered "normal" (left).

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